Which statement best describes bactericidal antibiotics?

• A. Inhibit bacterial growth
• B. Disrupt host cell function
• C. Inhibit viral replication
• D. Kill bacteria

Answer: (D)

Bactericidal antibiotics are defined by their ability to kill bacteria rather than just stop them from growing. This means they reduce the viable bacterial population directly, often by attacking essential bacterial structures or processes such as cell wall synthesis. The statement that best describes this action is that they kill bacteria. In contrast, many antibiotics merely inhibit growth (bacteriostatic), and others would affect host cells or target viruses, which are outside the scope of antibacterial killing. Examples of drugs that are commonly bactericidal include penicillins and cephalosporins, while tetracyclines are typically bacteriostatic.